(function($) {
$.extend({
    createUploadIframe: function(id, uri)
	{
		//create frame
		var frameId = 'jUploadFrame' + id;

		if(window.ActiveXObject) {
			var io = null;
			try {
				io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
			} catch(e){
				//IE9 compatibility
				io = document.createElement('iframe');
				io.setAttribute('id',frameId);
				io.setAttribute('name',frameId);
			}
		    if(typeof uri== 'boolean'){
		        io.src = 'javascript:false';
		    }
		    else if(typeof uri== 'string'){
		        io.src = uri;
		    }
		}
		else {
		    var io = document.createElement('iframe');
		    io.id = frameId;
		    io.name = frameId;
		}
		io.style.position = 'absolute';
		io.style.top = '-1000px';
		io.style.left = '-1000px';

		document.body.appendChild(io);

		return io;
    },

    createUploadForm: function(id, fileElementId)
	{
		//create form	
		var formId = 'jUploadForm' + id;
		var fileId = 'jUploadFile' + id;
		
		var form = $('<form action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');	
		var oldElement = $('#' + fileElementId);
		var newElement = $(oldElement).clone();
		$(oldElement).attr('id', fileId);
		$(oldElement).before(newElement);
		$(oldElement).appendTo(form);
		//set attributes
		$(form).css('position', 'absolute');
		$(form).css('top', '-1200px');
		$(form).css('left', '-1200px');
		$(form).appendTo('body');

		return form;
    },

    ajaxFileUpload: function(s) {
        // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout		
        s			= $.extend({}, $.ajaxSettings, s);
        var id		= new Date().getTime()        
		var form	= $.createUploadForm(id, s.fileElementId);
		var io 		= $.createUploadIframe(id, s.secureuri);
		var frameId = 'jUploadFrame' + id;
		var formId	= 'jUploadForm' + id;		
        
		// Watch for a new set of requests
        if ( s.global && ! $.active++ )
		{
			$.event.trigger( "ajaxStart" );
		}            
        var requestDone = false;
        
		// Create the request object
        var xml = {}   
        if ( s.global )
            $.event.trigger("ajaxSend", [xml, s]);
        
		// Wait for a response to come back
        var uploadCallback = function(isTimeout)
		{			
			var io = document.getElementById(frameId);
            try
			{
				if(io.contentWindow)
				{
					 xml.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
                	 xml.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
					 
				}
				else if(io.contentDocument)
				{
					xml.responseText = io.contentDocument.document.body?io.contentDocument.document.body.innerHTML:null;
                	xml.responseXML = io.contentDocument.document.XMLDocument?io.contentDocument.document.XMLDocument:io.contentDocument.document;
				}						
            }
			catch(e)
			{
				$.handleError(s, xml, null, e);
			}
			
            if ( xml || isTimeout == "timeout") 
			{				
                requestDone = true;
                var status;
                try
				{
                    status = isTimeout != "timeout" ? "success" : "error";
                    
					// Make sure that the request was successful or notmodified
                    if ( status != "error" )
					{
                        // process the data (runs the xml through httpData regardless of callback)
                        var data = $.uploadHttpData( xml, s.dataType );    

						// If a local callback was specified, fire it and pass it the data
                        if ( s.success )
                        {
                        	s.success( data, status );
						}

                        // Fire the global callback
                        if( s.global )
                        {
                        	$.event.trigger( "ajaxSuccess", [xml, s] );
						}                            
                    }
					else
					{
						$.handleError(s, xml, status);
					}
                }
				catch(e) 
				{
                    status = "error";
                    $.handleError(s, xml, status, e);
                }

                // The request was completed
                if( s.global )
                    $.event.trigger( "ajaxComplete", [xml, s] );

                // Handle the global AJAX counter
                if ( s.global && ! --$.active )
                    $.event.trigger( "ajaxStop" );

                // Process result
                if ( s.complete )
                    s.complete(xml, status);

                $(io).unbind()

                setTimeout(function()
									{try 
										{
											$(io).remove();
											$(form).remove();	
											
										} catch(e) 
										{
											$.handleError(s, xml, null, e);
										}									

									}, 100)

                xml = null

            }
        }
        // Timeout checker
        if ( s.timeout > 0 ) 
		{
            setTimeout(function(){
                // Check to see if the request is still happening
                if( !requestDone ) uploadCallback( "timeout" );
            }, s.timeout);
        }
        try 
		{
           // var io = $('#' + frameId);
			var form = $('#' + formId);
			$(form).attr('action', s.url);
			$(form).attr('method', 'POST');
			$(form).attr('target', frameId);
            if(form.encoding)
			{
                form.encoding = 'multipart/form-data';				
            }
            else
			{				
                form.enctype = 'multipart/form-data';
            }			
            $(form).submit();

        } catch(e) 
		{			
            $.handleError(s, xml, null, e);
        }
        if(window.attachEvent){
            document.getElementById(frameId).attachEvent('onload', uploadCallback);
        }
        else{
            document.getElementById(frameId).addEventListener('load', uploadCallback, false);
        } 		
        return {abort: function () {}};	

    },

    uploadHttpData: function( r, type ) {
		var data = !type;

		data	= type == "xml" || data ? r.responseXML : r.responseText;

		// If the type is "script", eval it in global context
		if ( type == "script" )
		{
			$.globalEval( data );
		}
		    
		// Get the JavaScript object, if JSON is used.
		if ( type == "json" )
		{
			//alert(data);
		    eval( "data = " + data );
		}

		// evaluate scripts within html
		if ( type == "html" )
		{
			$("<div>").html(data).evalScripts();
		}

		return data;
    }
});
})(joms.jQuery);